batman-adv: Consume skb in batadv_send_skb_to_orig

Sending functions in Linux consume the supplied skbuff. Doing the same in
batadv_send_skb_to_orig avoids the hack of returning -1 (-EPERM) to signal
the caller that he is responsible for cleaning up the skb.

Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
diff --git a/net/batman-adv/tvlv.c b/net/batman-adv/tvlv.c
index 77654f0..a783420 100644
--- a/net/batman-adv/tvlv.c
+++ b/net/batman-adv/tvlv.c
@@ -600,7 +600,6 @@
 	unsigned char *tvlv_buff;
 	unsigned int tvlv_len;
 	ssize_t hdr_len = sizeof(*unicast_tvlv_packet);
-	int res;
 
 	orig_node = batadv_orig_hash_find(bat_priv, dst);
 	if (!orig_node)
@@ -633,9 +632,7 @@
 	tvlv_buff += sizeof(*tvlv_hdr);
 	memcpy(tvlv_buff, tvlv_value, tvlv_value_len);
 
-	res = batadv_send_skb_to_orig(skb, orig_node, NULL);
-	if (res == -1)
-		kfree_skb(skb);
+	batadv_send_skb_to_orig(skb, orig_node, NULL);
 out:
 	batadv_orig_node_put(orig_node);
 }